do fins play an important rule?
Do they make a difference between a board running or being crap?
I tested some and they can be a reason for boards to loose grip, running not controlled or don't spending enough grip.
Important are even fins, made out of good quality with sharp edges.
I tested finf with not so sharp edges and then the board starts to bubble, meaning it doesn't cut through the water like a knife. Some also suck air which makes the board loosing grip.
But what about shapes? Do all shapes work or only a few?